We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green rectangular circuit board with gold edge connectors and black memory chips

A-Tech

A-Tech 8GB DDR4 2666MHz ECC RDIMM 1Rx8 Server Memory

SKU CH-F1J4-FZKWS

An 8 GB DDR4 2666 MHz ECC registered DIMM with CL19 latency and 1.2 V operation for server or workstation upgrades

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • 8GB capacity expands server multitasking headroom
  • DDR4 2666MHz speed accelerates data throughput
  • ECC RDIMM design detects and corrects memory errors
  • Registered 1Rx8 architecture stabilises heavy workloads
  • 2V operation matches standard DDR4 voltage

Server Memory Upgrade

This A-Tech module is an 8GB DDR4 2666MHz ECC Registered DIMM built as a compatible replacement for Hynix HMA81GR7CFR8N-VK and HMA81GR7MFR8N-VK. It runs at PC4-21300 speed with CL19 latency and standard 1.20V voltage. The 1Rx8 rank configuration fits server and workstation platforms that require registered memory.

Suitable For Verified Systems

Administrators replacing a failed Hynix stick or adding capacity to a qualified server chassis will find this module matches the original specifications. Buyers who need a different capacity per slot, a non-ECC unbuffered DIMM, or a faster data rate should look elsewhere. Compatibility must be confirmed against the system vendor's qualified memory list before purchase.

Registered ECC DDR4 2666MHz

The decisive specification is the Registered ECC DDR4 2666MHz (PC4-21300) interface with 1Rx8 organisation. Only systems designed for registered error-correcting modules at this exact speed can use it.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $54.99
Cheaper than about 83% of the 6,523 comparable items (median $188.99).
Total capacity 8 GB
Lower than about 80% of the 6,064 comparable items (median 32 GB).
Price per GB $6.87 per GB
Cheaper than about 54% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Product lineCompatible Replacement for Hynix
Model nameHMA81GR7CFR8N-VK, HMA81GR7MFR8N-VK
Total capacity8 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx8
Power
Rated voltage1.2 V

Questions about this item

My motherboard uses DDR4 RDIMM slots — will this 288-pin module fit?

Yes, the module is a standard DDR4 DIMM with 288 pins that matches DDR4 RDIMM slots.

Can I add this ECC RDIMM to a system that already has non-ECC UDIMMs installed?

No, registered ECC modules cannot be mixed with unbuffered non-ECC memory; the system requires all slots to use registered ECC DIMMs.

How do I confirm the module is running at 2666 MHz with ECC active after installation?

Check the BIOS memory information or use a tool such as CPU-Z to verify 2666 MT/s speed, CL19 timings and ECC status.

More in ECC Server RAM

Similar items